CN211571804U - Test device for simulating reinforcement of passive zone of foundation pit - Google Patents
Test device for simulating reinforcement of passive zone of foundation pit Download PDFInfo
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- CN211571804U CN211571804U CN201922076813.XU CN201922076813U CN211571804U CN 211571804 U CN211571804 U CN 211571804U CN 201922076813 U CN201922076813 U CN 201922076813U CN 211571804 U CN211571804 U CN 211571804U
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Abstract
The utility model discloses a test device for simulating the reinforcement of a passive area of a foundation pit, which comprises a test box, a supporting member, a reinforcing member and a test unit; the test box can simulate a soil body structure; the supporting member can apply or unload prestress to the soil body; the reinforcing component can realize the soil body reinforcement of the passive area of the foundation pit; the test unit is arranged on the backfill soil surface, the retaining wall surface and the supporting member and used for monitoring surface subsidence, lateral displacement of the retaining wall, soil pressure change conditions on two sides of the retaining wall in the excavation process and stress strain of the retaining wall and the supporting member. The utility model can simulate the soil body excavation and the bracing process after the foundation pit passive area is reinforced, can well simulate the supporting function of the inner support and the reinforcing efficiency of the passive area reinforcement, and obtains the supporting structure and the surrounding environmental stress and deformation condition of the foundation pit through monitoring; the utility model has the advantages of being simple in structure and convenient in operation, convenient to popularize and use.
Description
Technical Field
The utility model relates to a geotechnical engineering field especially relates to a reinforced (rfd) test device of passive district of simulation foundation ditch.
Background
In recent years, with the development and utilization of urban underground space, foundation pit engineering is developed in the direction of larger scale, deeper depth and more complex geological conditions and construction environments, the influence range and the influence degree of foundation pit excavation on the surrounding environment are larger and larger, and particularly, deep foundation pits are excavated in weak water-rich strata. At present, the foundation pit design concept has been obviously converted from strength control to deformation control. How to control the deformation of the supporting structure caused by excavation of the foundation pit and reduce the environmental impact is the primary content in the implementation process of the foundation pit engineering. Practice shows that the deformation of the foundation pit cannot be effectively controlled in a soft soil field by only depending on a supporting structure. The soil body reinforcement can obviously improve the physical and mechanical property index of soft soil, so as to achieve the purposes of controlling the deformation of a supporting structure and the ground settlement, the passive area reinforcement is widely applied in foundation pit engineering practice in recent years, and the main types adopted by the reinforcement include full reinforcement, strip-drawing reinforcement, grid reinforcement and the like. However, there is no clear reference for the current specifications and the relevant manuals, for example, how to reasonably determine the reinforcement range, how to consider the effect of the reinforced soil in the design calculation, and the like. Therefore, researchers at home and abroad carry out a large amount of research on the reinforcement of the passive region of the foundation pit, and the adopted main methods comprise numerical calculation, field actual measurement, theoretical analysis and the like. Due to numerous deformation influence factors and complex relations of the soft soil foundation pit, the theory of the influence on the foundation pit after the passive area is reinforced is quite weak, meanwhile, the calculation parameters in the numerical analysis are difficult to accurately select, and the numerical calculation result is often questionable. In addition, the on-site monitoring difficulty is higher, the cost is higher, and the real-time comparative analysis of various working conditions cannot be realized. The model test can strictly control main test parameters and simulate actual conditions to the maximum extent, and is a common means for solving the problems of large-scale complex geotechnical engineering. Therefore, it is necessary to develop a model test apparatus and method capable of simulating the influence of soil reinforcement in the passive area of the foundation pit on the supporting structure and the surrounding environment.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a simulation foundation ditch is reinforced (rfd) test device by active area.
In order to achieve the above purpose, the technical scheme of the utility model is that: an experimental device for simulating the reinforcement of a passive area of a foundation pit comprises a test box, a supporting member, a reinforcing member and a test unit;
the test box comprises a base, wherein a first upright column, a second upright column and a third upright column are sequentially arranged on one side of the upper end surface of the base, a fourth upright column, a fifth upright column and a sixth upright column are correspondingly arranged on the other side of the upper end surface of the base, soil retaining plates are arranged between the first upright column and the second upright column, between the first upright column and the fourth upright column, between the fourth upright column and the fifth upright column, vertically stacked soil retaining short plates are arranged between the second upright column and the third upright column, between the fifth upright column and the sixth upright column, a soil retaining wall is fixed between the second upright column and the fifth upright column, a plurality of first threaded through holes are uniformly arranged on the soil retaining wall, a vertically stacked soil retaining beam is arranged between the third upright column and the sixth upright column, and a second threaded through hole corresponding to the threaded through hole is arranged on the soil retaining beam; the retaining wall and the retaining plate form a first cavity, the retaining wall, the retaining beam and the retaining short plate form a second cavity, and backfill soil is arranged in the first cavity and the second cavity;
the supporting component comprises a first connecting rod and a second connecting rod which are coaxial and not connected, one end of the first connecting rod is arranged in the first threaded through hole, a pre-tightened spring, a spring pressing block and a limiting nut are sequentially sleeved outside the first connecting rod along the direction away from the first threaded through hole, a loading cylinder is further sleeved outside the spring pressing block, the tail end of the loading cylinder is in threaded connection with one end of the second connecting rod, the tail end of the second connecting rod is arranged in the second threaded through hole, the loading cylinder is rotated, the loading cylinder drives the spring pressing block to slide along the first connecting rod, the spring pressing block is enabled to extrude or keep away from the spring, and the supporting force formed by the pre-tightening of the spring on;
the reinforcing member comprises a supporting rod, wherein external threads are arranged at two ends of the supporting rod, two ends of the supporting rod are respectively arranged in the corresponding first threaded through hole and the second threaded through hole, a force transmission plate is sleeved outside one end, close to the first threaded through hole, of the supporting rod, the supporting rod is in threaded connection with the force transmission plate, and supporting force is applied to the retaining wall through the force transmission plate;
the testing unit comprises a plurality of electronic displacement meters, a soil pressure box and a strain gauge, wherein the electronic displacement meters are respectively arranged on the surface of the backfill soil and the surface of the retaining wall and are used for monitoring the surface settlement and the lateral displacement of the retaining wall; the soil pressure boxes are respectively arranged on two sides of the retaining wall and used for monitoring the change condition of soil pressure on two sides of the retaining wall in the excavation process; the strain gauge is arranged on the retaining wall and the second connecting rod respectively and used for monitoring the stress strain of the retaining wall and the supporting member in the excavation process of the foundation pit.
Furthermore, a groove is formed in the base, and the lower end of the retaining plate is embedded in the groove.
Furthermore, the soil blocking plate is made of toughened organic glass, and soil deep depth lines are marked on the toughened organic glass.
Furthermore, second stand and fifth stand inboard all are equipped with vertical recess, retaining wall sets up in the vertical recess of second stand and fifth stand.
Furthermore, the retaining wall adopts a particle concrete thin plate; gaps among the particle concrete thin plates, the second upright post and the fifth upright post are filled with mortar, and lateral boundary conditions of the underground diaphragm wall are simulated.
Furthermore, a handle is arranged on the loading cylinder.
The utility model has the advantages that: the utility model can simulate the soil body excavation and the bracing process after the foundation pit passive area is reinforced, can well simulate the supporting function of the inner support and the reinforcing efficiency of the passive area reinforcement, and obtains the supporting structure and the surrounding environmental stress and deformation condition of the foundation pit through monitoring; the inner support simulation unit can realize free loading and unloading of supporting force, and is closer to the engineering practice condition; the soil body reinforcement simulation units can be freely combined, the influences of different parameters such as reinforcement depth, reinforcement width, reinforcement strength and the like on the foundation pit can be simulated, and accurate control on excavation of a reinforcement area can be realized; the inboard side of foundation ditch adopts the side to keep off the native billet of soil temporarily, can demolish the side in advance when the excavation and keep off the native billet, carries out the foundation ditch excavation from the side, and convenient operation has changed traditional drawing out soil excavation mode from the soil body top, has obviously reduced manipulation strength. The utility model has the advantages of being simple in structure and convenient in operation, convenient to popularize and use.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a top view of the present invention;
FIG. 3 is a schematic structural view of a base;
FIG. 4 is a schematic structural view of a support member;
FIG. 5 is a schematic view of the construction of a retaining wall;
FIG. 6 is a side view of a retaining wall;
in the figure, 100, test chamber; 200. a support member; 300. a reinforcement member; 400. a test unit; 101. a base; 102. a first upright post; 103. a second upright post; 104. a third column; 105. a fourth column; 106. a fifth column; 107. a sixth upright post; 108. a soil guard plate; 109. a groove; 110. a soil retaining short plate; 111. a retaining wall; 112. a vertical groove; 113. a soil retaining beam; 201. a first connecting rod; 202. a second connecting rod; 203. a spring; 204. a spring pressing block; 205. a limit nut; 206. a loading drum; 207. a handle; 301. a support bar; 302. a force transmission plate; 401. an electronic displacement meter; 402. a soil pressure cell; 403. a strain gauge.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.
As shown in fig. 1, an experimental apparatus for simulating reinforcement of a passive area of a foundation pit includes a test box 100, a supporting member 200, a reinforcing member 300, and a test unit 400;
the test box can simulate a soil structure, the test box 100 comprises a base 101, a first upright post 102, a second upright post 103 and a third upright post 104 are sequentially arranged on one side of the upper end surface of the base 101, a fourth upright post 105, a fifth upright post 106 and a sixth upright post 107 are correspondingly arranged on the other side of the upper end surface of the base 101, a soil retaining plate 108 is arranged between the first upright post 102 and the second upright post 103, between the first upright post 102 and the fourth upright post 105 and between the fourth upright post 105 and the fifth upright post 106, a groove 109 is formed in the base 101, and the lower end of the soil retaining plate 108 is embedded in the groove 109; the soil blocking plate 108 is made of toughened organic glass, and soil depth lines are marked on the toughened organic glass; vertically laminated retaining short plates 110 are arranged between the second upright post 103 and the third upright post 104 and between the fifth upright post 106 and the sixth upright post 107, a retaining wall 111 is fixed between the second upright post 103 and the fifth upright post 106, the retaining wall 111 is made of particle concrete thin plates, vertical grooves 112 are formed in the inner sides of the second upright post 103 and the fifth upright post 106, the retaining wall 111 is arranged in the vertical grooves 112 of the second upright post 103 and the fifth upright post 106, and gaps between the retaining wall 111 and the second upright post 103 and between the retaining wall 111 and the fifth upright post 106 are filled with mortar, so that the lateral boundary condition of the underground continuous wall is simulated; a plurality of first threaded through holes (not shown in the figure) are uniformly arranged on the retaining wall 111, a retaining beam 113 which is vertically stacked is arranged between the third upright post 104 and the sixth upright post 107, and a second threaded through hole (not shown in the figure) corresponding to the threaded through hole is arranged on the retaining beam 113; the retaining wall 111 and the retaining plate 108 form a first cavity, the retaining wall 111, the retaining beam and the retaining short plate 110 form a second cavity, and backfill soil is arranged in the first cavity and the second cavity;
the supporting member can apply or remove prestress on a soil body, the supporting member 200 comprises a first connecting rod 201 and a second connecting rod 202 which are coaxial and unconnected, one end of the first connecting rod 201 is arranged in a first threaded through hole, a pre-tightened spring 203, a spring pressing block 204 and a limiting nut 205 are sequentially sleeved outside the first connecting rod 201 along the direction far away from the first threaded through hole, a loading cylinder 206 is further sleeved outside the spring pressing block 204, the tail end of the loading cylinder 206 is in threaded connection with one end of the second connecting rod 202, the tail end of the second connecting rod 202 is arranged in the second threaded through hole, a handle 207 is arranged on the loading cylinder 206, the loading cylinder 206 is rotated, the loading cylinder 206 drives the spring pressing block 204 to slide along the first connecting rod 201, the spring pressing block 204 is enabled to extrude or be far away from the spring 203, and the supporting force formed by the pre-tightening of;
the reinforcing member can realize the soil body reinforcement of a passive area of a foundation pit, the reinforcing member 300 comprises a supporting rod 301, two ends of the supporting rod 301 are respectively arranged in a corresponding first threaded through hole and a corresponding second threaded through hole, a force transmission plate 302 is sleeved outside one end of the supporting rod 301 close to the first threaded through hole, the supporting rod 301 is in threaded connection with the force transmission plate 302, and supporting force is applied to the retaining wall 111 through the force transmission plate 302;
the test unit 400 comprises a plurality of electronic displacement meters 401, a soil pressure cell 402 and a strain gauge 403, wherein the electronic displacement meters 401 are respectively arranged on the backfill soil surface and the retaining wall 111 surface and are used for monitoring the ground surface settlement and the lateral displacement of the retaining wall 111; the soil pressure boxes 402 are respectively arranged at two sides of the retaining wall 111 and used for monitoring the soil pressure change conditions at two sides of the retaining wall 111 in the excavation process; the strain gauges 403 are respectively disposed on the retaining wall 111 and the second connecting rod 202, and are used for monitoring the stress strain of the retaining wall 111 and the supporting member 200 during the excavation of the foundation pit.
The utility model can simulate the soil body excavation and the bracing process after the foundation pit passive area is reinforced, can well simulate the supporting function of the inner support and the reinforcing efficiency of the passive area reinforcement, and obtains the supporting structure and the surrounding environmental stress and deformation condition of the foundation pit through monitoring; the inner support simulation unit can realize free loading and unloading of supporting force, and is closer to the engineering practice condition; the soil body reinforcement simulation units can be freely combined, the influences of different parameters such as reinforcement depth, reinforcement width, reinforcement strength and the like on the foundation pit can be simulated, and accurate control on excavation of a reinforcement area can be realized; the inboard side of foundation ditch adopts the side to keep off the native billet of soil temporarily, can demolish the side in advance when the excavation and keep off the native billet, carries out the foundation ditch excavation from the side, and convenient operation has changed traditional drawing out soil excavation mode from the soil body top, has obviously reduced manipulation strength. The utility model has the advantages of being simple in structure and convenient in operation, convenient to popularize and use.
The test method of the test device for simulating the reinforcement of the passive area of the foundation pit comprises the following steps:
s1, mounting test box 100
Making the base 101 horizontal, installing the test box 100, and sealing the connection position;
s2 selection of reinforcing member 300
According to the actual working condition, the rigidity K of the single supporting rod 301 in the unit reinforcing area is calculated as follows:
K=( m2-m1) S
in the formula, m1 is the proportionality coefficient of the elastic resistance coefficient of the soil body before reinforcement, m2 is the proportionality coefficient of the elastic resistance coefficient of the soil body after reinforcement, and S is the cross-sectional area of the reinforced soil body corresponding to a single support rod 301;
selecting the support rod 301 according to the calculated rigidity;
s3 soil backfilling
A plurality of soil pressure boxes 402, electronic displacement meters 401 and strain gauges 403 are uniformly arranged on two sides of the soil retaining plate 108, and soil is filled and compacted in the first cavity and the second cavity in a layering mode respectively; when the reinforcing members are filled to a reinforcing area required by construction, a plurality of reinforcing members 300 are firstly installed between the retaining wall 111 and the retaining beam according to the construction requirement, and then soil is filled and compacted in a vibration compacting mode; backfilling upwards layer by layer, and after the backfilling is finished, arranging a plurality of electronic displacement meters 401 on the upper surface of the backfilled soil in the first cavity; and a strain gauge is adhered to the inner support simulation unit.
S4 excavation of foundation pit
Removing the retaining beam and the retaining short plate 110 on the uppermost layer, discharging backfill soil on the layer, arranging an electronic displacement meter 401 in the supporting member 200 according to construction requirements, arranging the installed supporting member 200 in the threaded through hole corresponding to the retaining wall 111 and the retaining beam, rotating the loading cylinder 206, and detecting the supporting force of the supporting member 200 through the strain gauge 403 until the supporting force meets the construction requirements; repeating the soil excavation and the installation steps of the supporting member 200, and constructing layer by layer downwards; when the foundation pit is excavated to the reinforced area, firstly discharging soil of the reinforced area, and then removing the reinforcing member 300 according to construction requirements; after the reinforcing member 300 is completely removed, continuing the steps of soil excavation and mounting of the supporting member 200 until the soil excavation is completed;
s5, result analysis
In the whole excavation process of the foundation pit, special equipment is adopted to record monitoring data of the electronic displacement meter 401, the soil pressure cell 402 and the strain gauge 403, and the stress and deformation rule of the foundation pit after the passive area is reinforced is obtained through sorting and analysis.
The described embodiments are only some, but not all embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the scope of the present invention.
Claims (6)
1. A test device for simulating the reinforcement of a passive area of a foundation pit is characterized by comprising a test box, a supporting member, a reinforcing member and a test unit;
the test box comprises a base, wherein a first upright column, a second upright column and a third upright column are sequentially arranged on one side of the upper end surface of the base, a fourth upright column, a fifth upright column and a sixth upright column are correspondingly arranged on the other side of the upper end surface of the base, soil retaining plates are arranged between the first upright column and the second upright column, between the first upright column and the fourth upright column, between the fourth upright column and the fifth upright column, vertically stacked soil retaining short plates are arranged between the second upright column and the third upright column, between the fifth upright column and the sixth upright column, a soil retaining wall is fixed between the second upright column and the fifth upright column, a plurality of first threaded through holes are uniformly arranged on the soil retaining wall, a vertically stacked soil retaining beam is arranged between the third upright column and the sixth upright column, and a second threaded through hole corresponding to the threaded through hole is arranged on the soil retaining beam; the retaining wall and the retaining plate form a first cavity, the retaining wall, the retaining beam and the retaining short plate form a second cavity, and backfill soil is arranged in the first cavity and the second cavity;
the supporting component comprises a first connecting rod and a second connecting rod which are coaxial and not connected, one end of the first connecting rod is arranged in the first threaded through hole, a pre-tightened spring, a spring pressing block and a limiting nut are sequentially sleeved outside the first connecting rod along the direction away from the first threaded through hole, a loading cylinder is further sleeved outside the spring pressing block, the tail end of the loading cylinder is in threaded connection with one end of the second connecting rod, the tail end of the second connecting rod is arranged in the second threaded through hole, the loading cylinder is rotated, the loading cylinder drives the spring pressing block to slide along the first connecting rod, the spring pressing block is enabled to extrude or keep away from the spring, and the supporting force formed by the pre-tightening of the spring on;
the reinforcing member comprises a supporting rod, wherein external threads are arranged at two ends of the supporting rod, two ends of the supporting rod are respectively arranged in the corresponding first threaded through hole and the second threaded through hole, a force transmission plate is sleeved outside one end, close to the first threaded through hole, of the supporting rod, the supporting rod is in threaded connection with the force transmission plate, and supporting force is applied to the retaining wall through the force transmission plate;
the testing unit comprises a plurality of electronic displacement meters, a soil pressure box and a strain gauge, wherein the electronic displacement meters are respectively arranged on the surface of the backfill soil and the surface of the retaining wall and are used for monitoring the surface settlement and the lateral displacement of the retaining wall; the soil pressure boxes are respectively arranged on two sides of the retaining wall and used for monitoring the change condition of soil pressure on two sides of the retaining wall in the excavation process; the strain gauge is arranged on the retaining wall and the second connecting rod respectively and used for monitoring the stress strain of the retaining wall and the supporting member in the excavation process of the foundation pit.
2. The test device for simulating the reinforcement of the passive area of the foundation pit as claimed in claim 1, wherein the base is provided with a groove, and the lower end of the retaining plate is embedded in the groove.
3. The test device for simulating the reinforcement of the passive area of the foundation pit as claimed in claim 2, wherein the soil retaining plate is made of tempered organic glass, and the tempered organic glass is marked with soil depth lines.
4. The test device for simulating the passive zone reinforcement of the foundation pit as claimed in claim 1, wherein the second upright column and the fifth upright column are provided with vertical grooves at the inner sides thereof, and the retaining wall is arranged in the vertical grooves of the second upright column and the fifth upright column.
5. The test device for simulating the passive zone reinforcement of the foundation pit as claimed in claim 4, wherein the retaining wall is made of a fine particle concrete sheet; and gaps among the particle concrete thin plate, the second upright post and the fifth upright post are filled with mortar.
6. The test device for simulating the reinforcement of the passive area of the foundation pit as claimed in claim 1, wherein the loading cylinder is provided with a handle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922076813.XU CN211571804U (en) | 2019-11-27 | 2019-11-27 | Test device for simulating reinforcement of passive zone of foundation pit |
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| CN201922076813.XU CN211571804U (en) | 2019-11-27 | 2019-11-27 | Test device for simulating reinforcement of passive zone of foundation pit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110805076A (en) * | 2019-11-27 | 2020-02-18 | 福建工程学院 | Test device and method for simulating reinforcement of passive area of foundation pit |
| CN113790699A (en) * | 2021-07-28 | 2021-12-14 | 浙江工业大学 | Retaining fixing device and different-depth horizontal displacement measurement test device |
| CN114718128A (en) * | 2022-04-06 | 2022-07-08 | 温州工程勘察院有限公司 | Deep basal pit deformation monitoring alarm device |
-
2019
- 2019-11-27 CN CN201922076813.XU patent/CN211571804U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110805076A (en) * | 2019-11-27 | 2020-02-18 | 福建工程学院 | Test device and method for simulating reinforcement of passive area of foundation pit |
| CN110805076B (en) * | 2019-11-27 | 2024-05-03 | 福建工程学院 | Test device and method for simulating reinforcement of passive area of foundation pit |
| CN113790699A (en) * | 2021-07-28 | 2021-12-14 | 浙江工业大学 | Retaining fixing device and different-depth horizontal displacement measurement test device |
| CN113790699B (en) * | 2021-07-28 | 2023-12-05 | 浙江工业大学 | Soil retaining fixing device and horizontal displacement measurement test device with different depths |
| CN114718128A (en) * | 2022-04-06 | 2022-07-08 | 温州工程勘察院有限公司 | Deep basal pit deformation monitoring alarm device |
| CN114718128B (en) * | 2022-04-06 | 2024-02-13 | 温州工程勘察院有限公司 | Deep foundation pit deformation monitoring alarm device |
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